Sewing machine



o. -Qulsr 2,414,168

SEWING MACH-'INE original Filed Der? 3b, 1959 4 sheets-sheet 1 WKN MN m. mm m. ,Q l. N NNN NW N QM. .N \W m N l sf. H WMM A M www MW S@ m, NN S sw NN mm S ,wg Nm l /N RN, NN NN ...M 1%. mw .N- I E* L ,N

Jan. 14, 1947.

INVENTOR ATTORNEY Jan. 14, 1947. Q QUlsT SEWING MCHINIE 4 sheets-sheet 2 Original Filed Dec. 30, 1939 l@ #EN INVETR ATTORNE O. QUIST SEWING MACHINE Jan. 14, 1947.

4 Sheets-Sheet 5' Original Filed Dec. 30, 1959 J'YGLZLZ INVENTOR PMM/7* ATTOR Y O. QUIST SEWING MACHINE Jan. 14, 1947.

Original Filed Deo. 30, 1939 4 Sheets-Sheet 4 I N VEN TOR.

ATTORNEY Patented dan. 14, 1947 SEWING MACHINE Oscar Quist, Chicago, Ill., assignor to Union Special Machine Company, Chicago, Ill., a corporation of Illinois Original application December 30, 1939, Serial No. 311,722, now Patent No. 2,345,992, dated April 4, 1944. Divided and this application February 26, 1943, Serial No. 477,189

3 Claims.

This invention relates to sewing machines, and more particularly to mechanism provided in such machines for lifting a presser foot which is arranged to retain work against a .base or other work support.

The present case is a division of application Ser. No. 311,722, led on December 30, 1939, now Patent No. 2,345,992, granted April 4, 1944.

An object of the invention has been to provide sim-ple but effective, conveniently located, and readily operable presser foot lifting devices in a machine which is substantially completely enclosed to facilitate lubrication.

The invention is especially concerned with a machine having a hollow frame comprising a base or work supporting member, a vertical standard and an overhanging arm, carrying a needle head at its outer end. The needle head is equipped with vertically movable needle and presser bars. A part of the setting for the invention is the provision of means within such a machine for distributing a ne mist or spray of lubricating oil within the hollow frame and delivering said oil to various operating parts including the mechanism` in the needle head. Another feature is the provision in such a machine of a presser bar lifting mechanism including a rock shaft extending longitudinally through the interior of the upper, hollow arm. Connections are provided from one end of the rock shaft, within the needle head, to the presser bar and connections are provided adjacent the other end of said shaft, at or near the hollow standard, for imparting a rocking movement to the shaft whenever it is desired to lift the presser bar. As a special advantageous feature of this construction, the connections for operating the rock shaft include a lever which is passed through the wall of the upper, hollow arm at a recess in the latter adjacent a bearing for the inner end of the shaft.

Another object of the invention has been to provide an enclosure for all of the moving parts of the machine, except those acting directly upon the work being sewed and those requiring manipulation from the outside, and to place these in protecting recesses, so as to avoid projections, particularly of moving parts, which might cause injury to the operators or with which the work might catch and become torn. Toward this end the means for operating the lever connected with the rock shaft includes a thrust bar extending downwardly from said lever through an opening in an overhanging portion of the work support, and attached at its lower end to a rock member mounted in a recessed or set-in portion of the base beneath the work support. Suitable connections are provided for rocking said member by a foot treadle or the like.

Other` objects, features and advantages of the invention will appear from a detailed description of an illustrative embodiment of the same which will now be given in conjunction with the accompanying drawings, in which:

Fig. I is a view in vertical longitudinal section of a lock stitch sewing machine embodying the present invention.

Fig. II shows the machine in top plan.

Fig. III is a horizontal section taken in a plane below the level of the work support of the machine.

Fig. IV is a view partly in elevation and partly in cross section, taken as approximately indicated by Athe angled arrows in Figs. I and III, with the cover of the needle head removed to expose the Parts at the interior, and

Fig. V shows the machine in rear end elevation with portions broken out and shown in section to better illustrate important details of the trame construction.

With refernce rs-t more particularly to Figs. I to IV, it will be observed that the machine chosen for exemplication of my invention has a hollow work-supporting base I with a top wall 2, front and rear side walls 3 and 4 and ends walls 5 and 6. The hollow 'I of the base l is closed at the bottom, with interposition of a sealing gasket 8, by a removable cover plate 9 and is employed as a sump for oil which is normally maintained at the level indicated at L. Rising from the base I at one end is a hollow standard I0,`which, at the bottom, communicates directly with the chamber I and with which is integrally formed a hollow arm II. As shown, the arm II overreaches the base I and terminates at its free end in a hollow head I2. A crosswise partition I3 isolates the hollow of the head I2 from the: hollow of the arm Il, which latter, at its rear end, communicates directly with the hollow of the standard I0, as best shown inY Fig. I. Extending longitudinally through the arm II and journaled in bushings I5 and I6, set, respectively, into the partition I3 and the rear wall of the standard IU is a rotary shaft II. As shown, 'this shaft I1 protrudes to the exterior of the frame arm at its right hand end and at its outer end carries a combined hand and belt wheel I8 by which the machine may be operated either manually or under power.

Conned to axial reciprocation in bushings I9 3 head I2, is a bar 2|, which, at its lower end, carries a needle 22. Through a link connection 23 with a crank pin 25 on a disk 26 at the end of the shaft Il within the hollow of the head I2 the needle bar 2l is given its reciprocating motion. Rotation of the needle bar 2l within its bearings is prevented through engagement of the outer end of the lower pivot pin 2 for the link 23 in a vertically-grooved guide 28 interiorly of the head l2. From Fig. I it will be noted that the drive shaft l'l also has journal sup-port in a sleeve 29 set into a pendant bearing lug 30 Within the hollow of the needle arm H. As shown in Fig. III, the end wall of the base is` angularly recessed as .at 35 to accommodate the loop taker of the machine, which, in this instance, has the form of a rotary hook 36 and which cooperates with the needle 22 beneath the work support 2 in stitch formation. The rotary hook 35 is secured to the protruding end of a shaft 3l which extends through a bearing sleeve 5t Xed in the end wall 5A of the base. Within the chamber '1,` the sleeve is supported in a bearing lug 39 pendant from the top wallI 2 of the base (see Figs. I and III) while theinner end of the hook shaft 3l' extending beyond the sleeve is journaled in a shorter sleeve cr bushing 33a set into another pendant lug iii Within said base spaced from the lug 39". Through aV pair of intermeshing spur gears il and 132, the

Yhook shaft 31 is driven from a rotary shaftV 43 which extends longitudinally of the chamber 'l and which is journaled in bearings, respectively, providedA by the end wall 5, the lug 3i!Y and a web projection i5 extending forwardly from the rear Wall 4 within the base. By means of a train of intermeshing spur gears 6, fili andy 48 within .the hollow of the standard I9, the lower shaft 4?. isA driven from the upper shaft Il in the same direction and at the same speed. It is, however, to

be noted that the ratio of the spur gears 4|Y and 4 42 is such as to impart two revolutions to the hook shaft 31'for each revolution ofthe upper shaft Il from which the needle bar Zl is` actuated.

The feed mechanism of the machine includes a feed dog 5f', the teeth of which operate upwardly f through slots 5l in a throat plate 52 set into the inner end, of a` cut-outY 53 in a cover plate 54, which is in. turn set into a depression 55 in the upper surface of the top wall 2 ofthe base l' at the front end of the latter (see Figs. I, II' and IV). From Fig. IV it will be observedi that the feed dog 5il is secured, with capacity for vertical adjustment, to a carrier 5t having; a cylindric shank which extends inwardly through a clearance opening 5l' in the longitudinally offset portion 58 of the end wall'5 of the base I.` The inner end' of the, carrier bar 55 is secured by set screws 59j'in a socket member 6U having a transverse boss El (see also Fig` III) in which a pin 62 is in turn secured for pivotal connection to the top of a rocker 53; This rocker reaches upwardly from a rock shaft t5 journaled' at its. opposite ends in bushings 65 and (il, respectively, set into the end wall 5 of the base and into the laterally offset portion, 63 of the. rear wall li'. Also secured to the rock shaft t5. within the chamber l is an upwardly extending arm S9, which, through a telescopic link 7G, is connected to the strap 'H of' an actuating eccentric l2 on the shaft 43. Under the influence of the eccentric l2 andthe interposed parts just described; horizontal feeding movements are imparted to the feed dog 55j. The means for regulating the feed throw ofthe feed dog 5@ includes a regulating shaft l5 (Figs. III

andV) which is journaled in the lugs 39 and 45 ,I adjusting rod 8l abuts.

v: with aknurled manipulating head $3.

hereinbefore referred to. An arm 16 von the left hand end (Fig. III) of the `regulating shaft 'l5 is connected by a lazy bar H to a stud 'I8 on the sleeve member of the telescopic link lll. At its right hand end beyond the bearing lug 45, the shaft 'E5 is provided with another arm 'i9 which is urged counterclockwise, as viewed from the right in Fig. III (see also Fig. V), by a torsion spring Se and against which the inner end of an As shown in Fig. V, the rod 8i has a screw-thread engagement with a lug 82 within the base l and extends at an inclination through the front wall of the standard It to the exterior. At its outer end the rod 8i is provided For further details as to the arrangement and operation of the rod 5l and other parts of the feed regulating means, reference may be had to the patent to Sauer and Smith, No. 2,035,508, granted on March 31, 1936. Lifting and lowering movements are imparted to the feed dog 5e from a crank 85 at the outer (left hand) end (Fig. III) ofthe lower shaft d, said crank being connectedthrough a Vertical link 85 with a curved depending arm 3l (Fig. IV) on the carrier 55 for the feed dog 5G. The construction and operationof the entire feed mechanism just describedl is substantially identical with that disclosed in the above-mentioned Sauer and Smith patent, to which reference may be had for details if found necessary.

In its feeding action, the dog 53 reacts with a presser foot 98 pivotally connectedA to a shank member 9i at the lower endV of a presser bar 92. As shown in Fig'. IV, thepresser bar QE'eXtends up through a bearing in the bottom of the needle head l2, and, within the hollow of thel'atter, carries a collar eti against which the lower endl of a helical compression spring 951 bears.`y At its top, the spring l abuts the upper bearingsleeve 96 for the rod S2, which sleeve is threaded'for adjustment in the needleihead i2 so-that the pressure of the spring may beregulatedas desired or required. l

InY order that the presser foot Silmay be raised to facilitate` insertion of the work'beneath it ini tially, there is provided a con-trol mechanism in cluding a shaft el within the hollowef the overhanging arm I'lv, saidshaft being journaledA at its opposite ends in thepartition I3- and in the lug t0, respectively. The left hand end of the shaft 9T (Fig. I) extendsthrough the partition I-3into thehollow of the needlehead l2 and there has an arm- 98 (Fig. IV), which, through a link-*93, is connected to a collar 93a which is slidable on the presser bar, and whichis normally spaced from the lower face of the collar' 53, so that during the operationof the-machine,v the presser bar.

is subject only to the influence of the spring 95; A torsion spring E00 surrounding-theend ofr the shaft 91"! within the head l2 tends to rotatesaid shaft clockwise in Fig. IV and through .thelink 99 causes theloosely mountedA collar 83a. onr the presser bar B2 to be normally heldv in its lower position in engagement with the bottom of the needlehead IZ- and away from-collar 93; Secured tothe shaft 9T within a lateral recess. l-Dlin, the lug 3) in the hollow of the frame arm I l- (Figs.l I, II and V) is an opera-ting lever H32- which reaches outward from said armv forv connection to a pendant link rod HB3. 'IhisV link rod |03- passes through a guide holev in the work support 2- and isl connected at its lower end to oneY extremity of a motion translating lever- |95 fulcr-umedon aY fixedstud let which extends outward from the pitched 5, inwardly recessed portion |61 of the rear side wall 4 of the base I. The other extremity of the lever |05 is engaged from beneath by a pad at the top of the thrust rod |08 which may extend to an actuating knee press or foot treadle, not illustrated. Due to the lateral recessing of the side wall 4, it will be seen that the presser foot control connections are kept within the eonnes of the work support 2 with consequent avoidance of projections therebeyond. i

As previously pointed out, the hollow of the base of the machine is utilized as an oil sump. For the purpose of circulating the oil within the machine to lubricate the various enclosed parts, the oil is lifted from the supply as a consequence of the dipping thereinto of the gear 46 on the lower shaft 43. The oil thus lifted is further carried up by the gears 41, 46 and, by the high speed rotation of the latter; dispersed in the form of a mist within the hollow of the standard I and the connecting hollow of the frame arm II. Some of this dispersed oil finds its way into a pocket ||0 (Fig. I) at the top of the right hand end bearing I6 for the drive shaft I1 and is conducted through a port III to the shaft surface within said bearing, any excess oil being returned into the base by way of a duct |I2 at the bottom of said bearing. Part of the dispersed oil is also caught by the open rear end |I3 of a tube ||5 which extends horizontally `forward within the hollow of the frame arm I I and through the partition I3 into the needle head |2.` Wick filled tubes II6, II1 and |I8 lead from the delivery end of the tube II5 and release oil from above onto the moving parts within the needle head I2. The excess oil thrown off by the needle operating mechanism is collected in a small sump I I 9 in the bottom of the needle head I2. Connecting with this sump |I9 is an inclined duct |20 which leads upward to a lateral port I 2| in the left hand end bearing bushing I5 for the shaft I1, which shaft, as shown in Fig. I, is formed within the confines of said bearing with two relatively wide interlapping spiral grooves |22 pitched in one direction and also with a shorter and narrower oppositely pitched groove |23. As the shaft I1 rotates, the helical groove |22 functions as a pump to constantly lift the accumulating oil from the sump I I0 in the needle head through the duct into the bearing I I5 to lubricate it and to discharge the excess from said bearing into the hollow of the frame arm II wherefrom it drains along the downwardly inclined slope at the bottom of said arm back into the base I. At the same time, the smaller reversely groove |23 slightly opposes the action of the longer groove |22 to maintain an oil seal within the bearing I5 and thus prevents air pumping when the shaft becomes worn. Some of the dispersed oil is, moreover, caught in a well |25 (Fig. I) integrally formed with the machine frame within the standard I0 above the lower shaft 43. Leading horizontally from the well |25 through the top wall 2 of the machine base I is a duct |26 which delivers into a channel |28 formed in the depressed free end portion 55 of said top wall.

As set forth in detail in said parent application, provision is made for the distribution of lubricant from the channel |28 to various bearing surfaces of the shafts 31 and 43, the gears 4I and 42, and the work feeding mechanism. The right hand end bearing for the shaft 43 is lubricated by oil passing directly down through a duct 45a from the wall |25.

' level in the base of the machine may be checked from time .to time, there is provided a gauge rod |60 which extends down into the base I and which at its top has a knob ISI accessible for convenience of grasping it within a recess I 62 formed in the walls of the standard I0 (see Figs. I and IV). Leakage of oil from the base I at the clearance opening 51 through which the feed dog carrier 56 extends is prevented by a moving sealing means |63 which, as shown in Figs. III and IV, comprises a plurality of washers |65 which snugly surround the cylindric shank of the carrier 56 and which are pressed against the face of a machined recess |66 in the inner side of the wall 58 by a leaf spring |61. At its lower end the spring |61 is secured to the wall portion 58, and at its upper end is bifurcated to straddle the shank of the feed dog carrier bar 56.

In order that the more delicate parts of the rotary hook 36 may be lubricated with a diiferent, lighter grade of oil from that used for the other moving parts of the machine, there is provided a separate source of supply for such oil in the form of a glass gravity feed cup, which is shown at |16 in Figs. II, IV and V as being mounted on the top of the base I in the rear of the standard I0. At the bottom, the cup |10 communicates with a vertical duct I1| in an enlargement I 12 at one corner of the -base I within the chamber 1. Leading from the duct I 1|. within the chamber 1 is a tube |13 b-y which the oil from the cup |10 is conducted to a nipple I 15 screwed axially into the inner or cap bearing for the hook shaft 31 as shown in Figs. I and III. As further shown in Fig. I, the hook shaft 31 is hollow and open within its inner bearing to receive the oil conveyed into said bearing by the tube |13. The internal construction of the rotary hook 36 may be as shown in U. S. Patent No. 2,035,984 granted to George Sauer on March 31, 1936, so that the oil may reach the bearing surfaces between its rotating and nonrotating parts. As a means for controlling the flow of oil to the rotary hook, there is provided a regulating screw I15a which engages radially into a collar enlargement |16 on the hook shaft 31 immediately behind the hook and externally of the end wall 5 of the base I. As shown, the inner end of the screw I15a is diametrically reduced and passes into the duct of the hook shaft topartially obstruct said duct. This construction is advantageous not only by reason of its simplicity but in that it permits accurate adjustment of the oil ilow to the hook without neces' sitating disassembling of the latter for the purpose.

While an illustrative embodiment of the invention has been set forth in considerable detail, it will be understood that numerous changes may be made in the construction, combination and arrangement of the various parts without departing from the principles and scope of the invention.

I claim:

1. In a sewing machine having a frame with a hollow work supporting base containing a supply of lubricating oil, and a hollow overhanging arm sustained by a hollow standard at one end of said base, the hollows of said base, arm and standard being intercommunicating, needle operating mechanism in a head at the free end of miams;

ther frame arm, and; means for elevating; oil from the/supply and dispersing itas rasmist within thel standard for. lubricating moving parts WithinV the frame,` the combination of aV presser: to up. and down movement. in. the. needlehead, and means for lifting thezpresser bar including* a horizontal. rock shaft. journalledv in. a, bearing' lugY within the frame arm adjacentthe upper end of said standard. alifting arm. on the shaft: with',- in the needle head" and connected' to. the; presser. bar, an operating` lever connected to the shaft in a.. recess. opening into the framefarm in'V the; bearinglug aforesaidand extending outward from said recess, the rear-` wall of the basebeing in,- wardly recessed, saidy recessed portion being over.- hung'` by the topiwalllof the base; a motion translating lever f-ulcrumed intermediate itsl ends` on a stud. projecting outward; from the recessed; wall portion of the base, said operating.` lever on: the rock shaft extending laterally from the frame; arm, at'hrust'. bar extending: down'from the. operating lever and. through a; guide hole inthe overhangingl portion of the work` support to one extremity of the motion translating; lever',4 and means enabling thev connection of the other eX'- tremity of the motion translating lever'to an actuatingfknee pressor footgtreadle.

2. Ina sewing machine having a` hollow frame with a work supporting. member, a vertical standard and an. overhanging arm in interoommunication, said arm carrying a needle head at its free end, the lower portion of said framebeing formed to provide a lubricanty sump. from which oil may be dispersedthrough said frame, theY combina.- tion of a` presser bar. movable up and down in bar confined.

said needle. head, arocky shaft extending longitudinally.- Within said arm, Y connections from-saidshaft. to said. presser bar for lifting; the same,V

opening in a; wall of. said overhanging Work supporting member being externally recessed in. its rear-wall at`r a; point beyond the nor-V mal; path. of travel of the work passing over said.

supporting member and, having. an yaperture through itsv worlesupportingv surface in the region of said recess; a rock memberl mounted. on saidwork: supporting member in saidrecess andV arranged tovbe. operated, atzwill, anda link passing: throughy said aperture connected. at, itsv opposite ends with said; rock member and with: said operating member.

3.. In. a sewingmachine, a. hollow frame; oomprisingY a1 base, a.standard rising-l from` oney end of. the -base,.and an overhanging arm extending from said. standard; over said base. and carrying a needle head. at,y its end, said; base` comprising an enclosed housing havingazgenerally rectangular outline in. plan but, having an external recess. in one side, a presser bar movable up and down in said needle head, and; means for lifting. said presser bar comprising; a. roel; member mounted insaidrecess. in said. side. of. the base exteriorly of the. enclosedhousing. a link connectedwith said mem.- ber extendingl along. said... standard, a. rock shaft within. said arm connected at: one end. with` saidi link and at its other: end. with. said presser, bai.; and spring; meansY operableV to hold` said` presser; bar lifting means normally; in an idle position.

OSCARzAQUIST. 

